Conﬁgure Cable Parameters

Configuring the ACIP

To assign the ATM interface on the ACIP to a cable headend and specify the cable headend IP address, perform the following tasks beginning in global conﬁguration mode:

Task		Command
Step 1	Specify the ATM interface, VPI, and headend	cable bind interface vpi ip-address
	IP address.

Step 2	Optionally, enable proxy-ARP handling if	cable enable-proxy interface vpi
	user-to-user communication is permitted for
	each channel.

Note The Cisco IOS software automatically adds the bridge number aging-time 604800 to the conﬁguration ﬁle.

Conﬁgure the Integrated Routing and Bridging Feature

After you have set up the interfaces in the router, you can enable integrated routing and bridging.

To enable integrated routing and bridging, perform the following task in global conﬁguration mode:

Task	Command
Enable integrated routing and bridging.	bridge irb

Use the show interfaces irb privileged EXEC command to display the protocols that a given bridged interface can route to the other routed interface when the packet is routable, and to display the protocols that a given bridged interface bridges.

Note For more information on the integrated routing and bridging feature, refer to the “Conﬁguring

Transparent Bridging” chapter of the Bridging and IBM Network Conﬁguration Guide.

Conﬁgure the Bridge-Group Virtual Interface

The bridge-group virtual interface resides in the router. It acts like a normal routed interface that does not support bridging, but represents the entire corresponding bridge group to routed interfaces within the router. The bridge-group virtual interface is assigned the number of the bridge group that it represents. The bridge-group virtual interface number is the link between the bridge-group virtual interface and its bridge group. Because the bridge-group virtual interface is a virtual routed interface, it has all the network layer attributes, such as a network address and the ability to perform ﬁltering. Only one bridge-group virtual interface is supported for each bridge group.

When you enable routing for a given protocol on the bridge-group virtual interface, packets coming from a routed interface but destined for a host in a bridged domain are routed to the bridge-group virtual interface, and are forwarded to the corresponding bridged interface. All trafﬁc routed to the bridge-group virtual interface is forwarded to the corresponding bridge group as bridged trafﬁc. All routable trafﬁc received on a bridged interface is routed to other routed interfaces as if it is coming directly from the bridge-group virtual interface.

ATM Cable Interface Processor (ACIP) Installation and Configuration 23